ref: 7b14564af92177533bbdd185c9132671cabbeee0
dir: /src/wavpack.c/
/* libSoX file format: WavPack (c) 2008 robs@users.sourceforge.net
*
* This library is free software; you can redistribute it and/or modify it
* under the terms of the GNU Lesser General Public License as published by
* the Free Software Foundation; either version 2.1 of the License, or (at
* your option) any later version.
*
* This library is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser
* General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public License
* along with this library; if not, write to the Free Software Foundation,
* Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
#include "sox_i.h"
#include "wavpack/wavpack.h"
typedef struct {
WavpackContext * codec;
size_t first_block_size;
} priv_t;
static int32_t ft_read_b_buf(void * ft, void * buf, int32_t len) {
return (int32_t)lsx_read_b_buf((sox_format_t *)ft, buf, (size_t)len);}
static uint32_t ft_tell(void * ft) {
return lsx_tell((sox_format_t *)ft);}
static int ft_seek_abs(void * ft, uint32_t offset) {
return lsx_seeki((sox_format_t *)ft, (off_t)offset, SEEK_SET);}
static int ft_seek_rel(void * ft, int32_t offset, int mode) {
return lsx_seeki((sox_format_t *)ft, (off_t)offset, mode);}
static int ft_unreadb(void * ft, int b) {
return lsx_unreadb((sox_format_t *)ft, (unsigned)b);}
static uint32_t ft_filelength(void * ft) {
return lsx_filelength((sox_format_t *)ft);}
static int ft_is_seekable(void *ft) {
return ((sox_format_t *)ft)->seekable;}
static int32_t ft_write_b_buf(void * ft, void * buf, int32_t len) {
priv_t * p = (priv_t *)((sox_format_t *)ft)->priv;
if (!p->first_block_size)
p->first_block_size = len;
return (int32_t)lsx_write_b_buf((sox_format_t *)ft, buf, (size_t)len);}
static WavpackStreamReader io_fns = {
ft_read_b_buf, ft_tell, ft_seek_abs, ft_seek_rel,
ft_unreadb, ft_filelength, ft_is_seekable, ft_write_b_buf
};
static int start_read(sox_format_t * ft)
{
priv_t * p = (priv_t *)ft->priv;
char msg[80];
p->codec = WavpackOpenFileInputEx(&io_fns, ft, NULL, msg, OPEN_NORMALIZE, 0);
ft->encoding.bits_per_sample = WavpackGetBytesPerSample(p->codec) << 3;
ft->signal.channels = WavpackGetNumChannels(p->codec);
if (WavpackGetSampleRate(p->codec) && ft->signal.rate && ft->signal.rate != WavpackGetSampleRate(p->codec))
lsx_warn("`%s': overriding sample rate", ft->filename);
else ft->signal.rate = WavpackGetSampleRate(p->codec);
ft->signal.length = WavpackGetNumSamples(p->codec) * ft->signal.channels;
ft->encoding.encoding = (WavpackGetMode(p->codec) & MODE_FLOAT)?
SOX_ENCODING_WAVPACKF : SOX_ENCODING_WAVPACK;
return SOX_SUCCESS;
}
static size_t read_samples(sox_format_t * ft, sox_sample_t * buf, size_t len)
{
priv_t * p = (priv_t *)ft->priv;
size_t i, actual = WavpackUnpackSamples(p->codec, buf, (uint32_t) len / ft->signal.channels) * ft->signal.channels;
for (i = 0; i < actual; ++i) switch (ft->encoding.bits_per_sample) {
case 8: buf[i] = SOX_SIGNED_8BIT_TO_SAMPLE(buf[i],); break;
case 16: buf[i] = SOX_SIGNED_16BIT_TO_SAMPLE(buf[i],); break;
case 24: buf[i] = SOX_SIGNED_24BIT_TO_SAMPLE(buf[i],); break;
case 32: buf[i] = ft->encoding.encoding == SOX_ENCODING_WAVPACKF?
SOX_FLOAT_32BIT_TO_SAMPLE(*(float *)&buf[i], ft->clips) :
SOX_SIGNED_32BIT_TO_SAMPLE(buf[i],);
break;
}
return actual;
}
static int stop_read(sox_format_t * ft)
{
priv_t * p = (priv_t *)ft->priv;
WavpackCloseFile(p->codec);
return SOX_SUCCESS;
}
static int start_write(sox_format_t * ft)
{
priv_t * p = (priv_t *)ft->priv;
WavpackConfig config;
p->codec = WavpackOpenFileOutput(ft_write_b_buf, ft, NULL);
memset(&config, 0, sizeof(config));
config.bytes_per_sample = ft->encoding.bits_per_sample >> 3;
config.bits_per_sample = ft->encoding.bits_per_sample;
config.channel_mask = ft->signal.channels == 1? 4 :
ft->signal.channels == 2? 3 : (1 << ft->signal.channels) - 1;
config.num_channels = ft->signal.channels;
config.sample_rate = (int32_t)(ft->signal.rate + .5);
config.flags = CONFIG_VERY_HIGH_FLAG;
if (!WavpackSetConfiguration(p->codec, &config, ft->signal.length? (uint32_t) ft->signal.length / ft->signal.channels : (uint32_t)-1)) {
lsx_fail_errno(ft, SOX_EHDR, WavpackGetErrorMessage(p->codec));
return SOX_EOF;
}
WavpackPackInit(p->codec);
return SOX_SUCCESS;
}
static size_t write_samples(sox_format_t * ft, const sox_sample_t * buf, size_t len)
{
priv_t * p = (priv_t *)ft->priv;
size_t i;
int32_t * obuf = lsx_malloc(len * sizeof(*obuf));
int result;
for (i = 0; i < len; ++i) switch (ft->encoding.bits_per_sample) {
case 8: obuf[i] = SOX_SAMPLE_TO_SIGNED_8BIT(buf[i], ft->clips); break;
case 16: obuf[i] = SOX_SAMPLE_TO_SIGNED_16BIT(buf[i], ft->clips); break;
case 24: obuf[i] = SOX_SAMPLE_TO_SIGNED_24BIT(buf[i], ft->clips) << 8;
obuf[i] >>= 8; break;
case 32: obuf[i] = ft->encoding.encoding == SOX_ENCODING_WAVPACKF?
SOX_SAMPLE_TO_SIGNED_24BIT(*(float *)&buf[i], ft->clips) :
SOX_SAMPLE_TO_SIGNED_32BIT(buf[i], ft->clips);
break;
}
result = WavpackPackSamples(p->codec, obuf, (uint32_t) len / ft->signal.channels);
free(obuf);
return result? len : 0;
}
static int stop_write(sox_format_t * ft)
{
priv_t * p = (priv_t *)ft->priv;
WavpackFlushSamples(p->codec);
if (!WavpackFlushSamples(p->codec)) {
lsx_fail_errno(ft, SOX_EINVAL, "%s", WavpackGetErrorMessage(p->codec));
return SOX_EOF;
}
if (ft->seekable && WavpackGetNumSamples(p->codec) != WavpackGetSampleIndex(p->codec) && p->first_block_size >= 4) {
char * buf = lsx_malloc(p->first_block_size);
lsx_rewind(ft);
lsx_readchars(ft, buf, p->first_block_size);
if (!memcmp(buf, "wvpk", (size_t)4))
WavpackUpdateNumSamples(p->codec, buf);
}
p->codec = WavpackCloseFile(p->codec);
return SOX_SUCCESS;
}
static int seek(sox_format_t * ft, uint64_t offset)
{
priv_t * p = (priv_t *)ft->priv;
return WavpackSeekSample(p->codec, (uint32_t) (offset / ft->signal.channels))? SOX_SUCCESS : SOX_EOF;
}
SOX_FORMAT_HANDLER(wavpack)
{
static char const * const names[] = {"wv", NULL};
static unsigned const write_encodings[] = {
SOX_ENCODING_WAVPACK, 8, 16, 24, 32, 0,
SOX_ENCODING_WAVPACKF, 32, 0,
0};
static sox_format_handler_t handler = {SOX_LIB_VERSION_CODE,
"Lossless, lossy, and hybrid audio compression",
names, 0,
start_read, read_samples, stop_read,
start_write, write_samples, stop_write,
seek, write_encodings, NULL, sizeof(priv_t)
};
return &handler;
}